Punching-machine



UNITED STATES PATENT OFFICE.

JOHN M. LONG AND CHARLES E. MGBETH, OF HAMILTON, OElIO.

PUNCHING-MACHINE.

SPECIFICATION forming part of Letters Patent No. 252,111, dated January 1(1), 1882. Application filed July 11, 1881. (No model.)

' To all whom it may concern:

Be it known that we, JOHN M. Lone and CHARLES E. MGBETH, of Hamilton, Butler county, Ohio, have invented certain new and useful Improvements in Punching-Machines, of which the following is a specification.

This invention relates to punching and shearing machines operated by power through the medium of a cam-shaft and sliding plunger;

The invention relates to an improved form of adjustable pull-off or stripper in which all sliding-shank adjustments are dispensed with; to a stop-motion device for causing thepunch to cease its motion after each stroke; tea device for adj ustingthe point at which the punch shall cease its motion after each stroke, and to a device by means of which the motion of the punch can be arrested at any time and any point in its stroke with instant certainty.

In the accompanying drawings, Figure 1 is a side elevation of a punching-machine embodying our improvements. Fig. 2 is a front view of the sliding clutch; Fig. 3, a front view of the stripper-cam and yoke; Fig. 4, a front view of the guide-head open and exposin g the mechanism of the plunger, and Fig. 5 a rear view of the sliding clutch.

In the drawings, A is the body of the machine; B, the plunger; l, the punch; m, the die; .9, the guide-head for the plunger; (J, the shaft, and D the driving-gear, all located and arranged to operate in the usual man nor.

In Fig. 1, R is the stripper. Instead of the usual sliding shank, shim, and other awkward adjusting devices, we use a lever backed by an adjustable abutment. The stripper is of the form of a lever, B S T, pivoted to the body of the machine. at S. This general form of stripper is not new with us, as a weighted lever has been used for this purpose.

At U is a series of holes adapted to receive an abutment-pin. These holes are in the body of the machine, or in a piece bolted thereto, and are so located that a pin inserted in a hole will come under the rear end of the stripperlever and serve to prevent the front end rising. As there is but small strain at the long end of the lever, the pin is not liable to become jammed or bruised, so as to interfere with ready change. While the pin and holes offer a most simple and cheap means of adjustment,

we consider that other methods and means of adjusting a rigid abutment under the long end of a stripper-lever would come within the spirit of our invention.

The stop-motion by which the punch is caused to cease its motion after each stroke is effected as follows: The gear D is loose on the shaft 0, andhas a clutch, E, upon its front hub. A sliding clutch, G, is feathered on the shaft 0 and adapted to engage with the gear-clutoh, as shown. The ordinarylever system,J I H 00, serves to throw theclutch into gear when a foot is placed on treadle J. Spring L, acting on lever K, tends to throw and hold clutch Gr out of gear. The slidingclutch G has a collar, M. A spring-pin, O, is fixed vertically above the collar M, and to this pin is attached the hand-lever Q. Thespring-pin 0 tends to go downward. The lever may lift it. When the clutch G is in normal open position the pin 0 bears on the periphery of the collar M, and is by it held in an upward position. Neglecting the pin 0, it will be seen that normally the' gear D is revolving, the clutch Gopen, and the main shaft 0 stationary. Pressin g treadle J closes the clutch, sets the main shaft in motion, and maintains the motion so long as pressure is maintained upon the treadle J. Upon removing the pressure the spring L instantly opens the clutch and stops the shaft 0. When the clutch is closed by toot-pressure the pin 0 falls behind the collar M and prevents the opening of the clutch. The machine would thus run even with the foot of the treadle. The lever Q can be used to displace the pin and stop the shaft instantly at any time. There is a notch,N,in the collar-M. When this notch passes the pin 0 while holding the clutch closed, the clutch can and will instantly uncouple, the notch straddling the pin. The notch is shown also in Fig. 2 at N. It is seen that owing to the presence of-the notch the pin 0 ceases its function as a detainer of the clutch in a closed position at each revolution; that the shaft 0 will thus cease revolution at each turn; that each stroke of the punch will require a reclosing of the clutch by the foot, and that the automatic opening of the clutch will occur at the same point in each revolution of the shaft, and thus leave the punch stationary in a fixed position identical at each stroke. The notch Nis generally so located as to effect the stoppage of the punch at its extreme upward position.

Our improvements include an adjustable notch, thus permitting the punch to stop at any desired point-say at the level of the bottom of the stripper-so that when the machine is started the punch will enter the sheet before nervous action of the attendants hands disturbs the carefully-set work. The collar M, instead of being integral with the clutch G, is separate, being a ring bolted against a flange, a on the clutch G. The flange has a segmental slot and bolt, b, (shown in Fig. 5,) for securing the parts alter being set. Other means equivalent to the slot and bolt may be utilized to bind the adjustable ring M to the clutch in any desired rotary position. When the stoppin enters the notch N it obviously prevents the shaft being turned by hand, in case the maehinehasan attachment for turning the main shaft in that manner. For this reason the approaching side 0 of the notch N is beveled, as shown, so that the pin 0 may ride up out of the notch when the shaft is turned by hand. 7

We claim as our invention- 1. The combination, with a punching-machine having a stripper-lever pivoted to the body of the machine, of the abutmentpin U and series of abutment-seats U, for supporting the idle end of the stripper-lever, substantially as set forth.

2. The combination, with a punching-machine having a rotary actuating-shaft, of the clutch-gear D,slidin g clutch G, with levers to close it and spring L to open it, 'of the springpin 0 and the collar M, having the notch N, substantiallyas and for the purpose specified.

3. The combination, with a punching-ma- 40 I chine having a rotary actuating-shaft, of the clutch-gear D, sliding clutch G, with levers to close it and spring L to open it, and springpin 0, of the notched collar N M, fixed on the sliding clutch G, and the device for adjusting said collar around said clutch, substantially as and for the purpose specified. 4'. Thecombination,in a punching-machine,

of a driving-shaft, a clutch-wheel loose on said shaft, a sliding clutch splined on said shaft, a spring to hold the clutch out of engagement, a treadle or lever to throw the clutch into engagement, a pin arranged to drop behind the clutch and maintain its engagement, and a hand-lever for removing said pin and permitting the clutch to disengage, substantially as set forth.

' 5. The combination, with spring-pin O, of clutch-collar M, having notch N, with beveled side 0, substantially as and for the purpose 6o specified. I

Joan M. LON-G. CHARLES E. MoBETH.

Witnesses:

ISAAC J. GRAHAM, JOHN SoRENz. 

